Mercurial > hg > nginx
comparison src/stream/ngx_stream_split_clients_module.c @ 6632:787dcc15b802
Stream: split_clients module.
author | Vladimir Homutov <vl@nginx.com> |
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date | Tue, 12 Jul 2016 17:34:52 +0300 |
parents | src/http/modules/ngx_http_split_clients_module.c@b78cf2414fda |
children |
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6631:80875b75d27e | 6632:787dcc15b802 |
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1 | |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 * Copyright (C) Nginx, Inc. | |
5 */ | |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_stream.h> | |
11 | |
12 | |
13 typedef struct { | |
14 uint32_t percent; | |
15 ngx_stream_variable_value_t value; | |
16 } ngx_stream_split_clients_part_t; | |
17 | |
18 | |
19 typedef struct { | |
20 ngx_stream_complex_value_t value; | |
21 ngx_array_t parts; | |
22 } ngx_stream_split_clients_ctx_t; | |
23 | |
24 | |
25 static char *ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, | |
26 void *conf); | |
27 static char *ngx_stream_split_clients(ngx_conf_t *cf, ngx_command_t *dummy, | |
28 void *conf); | |
29 | |
30 static ngx_command_t ngx_stream_split_clients_commands[] = { | |
31 | |
32 { ngx_string("split_clients"), | |
33 NGX_STREAM_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE2, | |
34 ngx_conf_split_clients_block, | |
35 NGX_STREAM_MAIN_CONF_OFFSET, | |
36 0, | |
37 NULL }, | |
38 | |
39 ngx_null_command | |
40 }; | |
41 | |
42 | |
43 static ngx_stream_module_t ngx_stream_split_clients_module_ctx = { | |
44 NULL, /* preconfiguration */ | |
45 NULL, /* postconfiguration */ | |
46 | |
47 NULL, /* create main configuration */ | |
48 NULL, /* init main configuration */ | |
49 | |
50 NULL, /* create server configuration */ | |
51 NULL /* merge server configuration */ | |
52 }; | |
53 | |
54 | |
55 ngx_module_t ngx_stream_split_clients_module = { | |
56 NGX_MODULE_V1, | |
57 &ngx_stream_split_clients_module_ctx, /* module context */ | |
58 ngx_stream_split_clients_commands, /* module directives */ | |
59 NGX_STREAM_MODULE, /* module type */ | |
60 NULL, /* init master */ | |
61 NULL, /* init module */ | |
62 NULL, /* init process */ | |
63 NULL, /* init thread */ | |
64 NULL, /* exit thread */ | |
65 NULL, /* exit process */ | |
66 NULL, /* exit master */ | |
67 NGX_MODULE_V1_PADDING | |
68 }; | |
69 | |
70 | |
71 static ngx_int_t | |
72 ngx_stream_split_clients_variable(ngx_stream_session_t *s, | |
73 ngx_stream_variable_value_t *v, uintptr_t data) | |
74 { | |
75 ngx_stream_split_clients_ctx_t *ctx = | |
76 (ngx_stream_split_clients_ctx_t *) data; | |
77 | |
78 uint32_t hash; | |
79 ngx_str_t val; | |
80 ngx_uint_t i; | |
81 ngx_stream_split_clients_part_t *part; | |
82 | |
83 *v = ngx_stream_variable_null_value; | |
84 | |
85 if (ngx_stream_complex_value(s, &ctx->value, &val) != NGX_OK) { | |
86 return NGX_OK; | |
87 } | |
88 | |
89 hash = ngx_murmur_hash2(val.data, val.len); | |
90 | |
91 part = ctx->parts.elts; | |
92 | |
93 for (i = 0; i < ctx->parts.nelts; i++) { | |
94 | |
95 ngx_log_debug2(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, | |
96 "stream split: %uD %uD", hash, part[i].percent); | |
97 | |
98 if (hash < part[i].percent || part[i].percent == 0) { | |
99 *v = part[i].value; | |
100 return NGX_OK; | |
101 } | |
102 } | |
103 | |
104 return NGX_OK; | |
105 } | |
106 | |
107 | |
108 static char * | |
109 ngx_conf_split_clients_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
110 { | |
111 char *rv; | |
112 uint32_t sum, last; | |
113 ngx_str_t *value, name; | |
114 ngx_uint_t i; | |
115 ngx_conf_t save; | |
116 ngx_stream_variable_t *var; | |
117 ngx_stream_split_clients_ctx_t *ctx; | |
118 ngx_stream_split_clients_part_t *part; | |
119 ngx_stream_compile_complex_value_t ccv; | |
120 | |
121 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_stream_split_clients_ctx_t)); | |
122 if (ctx == NULL) { | |
123 return NGX_CONF_ERROR; | |
124 } | |
125 | |
126 value = cf->args->elts; | |
127 | |
128 ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t)); | |
129 | |
130 ccv.cf = cf; | |
131 ccv.value = &value[1]; | |
132 ccv.complex_value = &ctx->value; | |
133 | |
134 if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) { | |
135 return NGX_CONF_ERROR; | |
136 } | |
137 | |
138 name = value[2]; | |
139 | |
140 if (name.data[0] != '$') { | |
141 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
142 "invalid variable name \"%V\"", &name); | |
143 return NGX_CONF_ERROR; | |
144 } | |
145 | |
146 name.len--; | |
147 name.data++; | |
148 | |
149 var = ngx_stream_add_variable(cf, &name, NGX_STREAM_VAR_CHANGEABLE); | |
150 if (var == NULL) { | |
151 return NGX_CONF_ERROR; | |
152 } | |
153 | |
154 var->get_handler = ngx_stream_split_clients_variable; | |
155 var->data = (uintptr_t) ctx; | |
156 | |
157 if (ngx_array_init(&ctx->parts, cf->pool, 2, | |
158 sizeof(ngx_stream_split_clients_part_t)) | |
159 != NGX_OK) | |
160 { | |
161 return NGX_CONF_ERROR; | |
162 } | |
163 | |
164 save = *cf; | |
165 cf->ctx = ctx; | |
166 cf->handler = ngx_stream_split_clients; | |
167 cf->handler_conf = conf; | |
168 | |
169 rv = ngx_conf_parse(cf, NULL); | |
170 | |
171 *cf = save; | |
172 | |
173 if (rv != NGX_CONF_OK) { | |
174 return rv; | |
175 } | |
176 | |
177 sum = 0; | |
178 last = 0; | |
179 part = ctx->parts.elts; | |
180 | |
181 for (i = 0; i < ctx->parts.nelts; i++) { | |
182 sum = part[i].percent ? sum + part[i].percent : 10000; | |
183 if (sum > 10000) { | |
184 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
185 "percent total is greater than 100%%"); | |
186 return NGX_CONF_ERROR; | |
187 } | |
188 | |
189 if (part[i].percent) { | |
190 last += part[i].percent * (uint64_t) 0xffffffff / 10000; | |
191 part[i].percent = last; | |
192 } | |
193 } | |
194 | |
195 return rv; | |
196 } | |
197 | |
198 | |
199 static char * | |
200 ngx_stream_split_clients(ngx_conf_t *cf, ngx_command_t *dummy, void *conf) | |
201 { | |
202 ngx_int_t n; | |
203 ngx_str_t *value; | |
204 ngx_stream_split_clients_ctx_t *ctx; | |
205 ngx_stream_split_clients_part_t *part; | |
206 | |
207 ctx = cf->ctx; | |
208 value = cf->args->elts; | |
209 | |
210 part = ngx_array_push(&ctx->parts); | |
211 if (part == NULL) { | |
212 return NGX_CONF_ERROR; | |
213 } | |
214 | |
215 if (value[0].len == 1 && value[0].data[0] == '*') { | |
216 part->percent = 0; | |
217 | |
218 } else { | |
219 if (value[0].len == 0 || value[0].data[value[0].len - 1] != '%') { | |
220 goto invalid; | |
221 } | |
222 | |
223 n = ngx_atofp(value[0].data, value[0].len - 1, 2); | |
224 if (n == NGX_ERROR || n == 0) { | |
225 goto invalid; | |
226 } | |
227 | |
228 part->percent = (uint32_t) n; | |
229 } | |
230 | |
231 part->value.len = value[1].len; | |
232 part->value.valid = 1; | |
233 part->value.no_cacheable = 0; | |
234 part->value.not_found = 0; | |
235 part->value.data = value[1].data; | |
236 | |
237 return NGX_CONF_OK; | |
238 | |
239 invalid: | |
240 | |
241 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, | |
242 "invalid percent value \"%V\"", &value[0]); | |
243 return NGX_CONF_ERROR; | |
244 } |